<template>
  <div class="top-category">
    <div class="container">
      <!-- 面包屑 -->
      <XtxBread>
        <XtxBreadItem to="/">首页</XtxBreadItem>
        <Transition name='fade-right' mode='out-in'>
          <XtxBreadItem :key='TopCategory.id'>{{ TopCategory.name }}</XtxBreadItem>
        </Transition>
      </XtxBread>
      <!-- 轮播图 -->
      <XtxCarousel :sliders="sliders" style="height:500px" />
      <!-- 全部二级分类 -->
      <div class="sub-list">
        <h3>全部分类</h3>
        <ul>
          <li v-for="item in TopCategory.children" :key="item.id">
            <a href="javascript:;">
              <img :src="item.picture" >
              <p>{{ item.name }}</p>
            </a>
          </li>
        </ul>
      </div>
      <!-- 不同分类商品 -->
      <div class="ref-goods" v-for='groupItem in subList' :key='groupItem.id'>
        <div class="head">
          <h3>- {{ groupItem.name }} -</h3>
          <p class="tag">温暖柔软，品质之选</p>
          <XtxMore />
        </div>
        <div class="body">
          <GoodsItem v-for="subItem in groupItem.goods" :key="subItem.id" :goods='subItem' />
        </div>
      </div>
    </div>
  </div>
</template>
<script>
import { computed, ref, watch } from 'vue'
import { reqFindBanner } from '@/api/home'
import { reqTopCategory } from '@/api/category'
import { useStore } from 'vuex'
import { useRoute } from 'vue-router'
import GoodsItem from './components/goods-item.vue'
export default {
  name: 'TopCategory',
  components: {
    GoodsItem
  },
  setup () {
    // 轮播图
    const sliders = ref([])
    reqFindBanner().then(data => {
      sliders.value = data.result
    })
    // 拿到当前顶级分类：根据路由params id匹配
    const store = useStore()
    const route = useRoute()
    const TopCategory = computed(() => {
      let curTopCategory = {}
      const item = store.state.category.list.find(item => item.id === route.params.id)
      if (item) curTopCategory = item
      return curTopCategory
    })
    // 获取分类商品数据
    const subList = ref([])
    const getSubList = () => {
      reqTopCategory(route.params.id).then(data => {
        subList.value = data.result.children
      // console.log(route.params)
      })
    }
    // 动态路由不会重新初始化组件 监听地址栏id的变化，然后变化了就去加载数据，但是初始化有不会加载了。
    // 不过watch提供了 immediate: true 可让watch初始化的时候主动触发一次。
    watch(() => route.params.id, (newVal) => {
      if (newVal && `/category/${route.params.id}` === route.path) getSubList()
    }, { immediate: true })
    return { sliders, TopCategory, getSubList, subList }
  }
}
</script>
<style scoped lang="less">
.top-category {
  h3 {
    font-size: 28px;
    color: #666;
    font-weight: normal;
    text-align: center;
    line-height: 100px;
  }
  .sub-list {
    margin-top: 20px;
    background-color: #fff;
    ul {
      display: flex;
      padding: 0 32px;
      flex-wrap: wrap;
      li {
        width: 168px;
        height: 160px;
        a {
          text-align: center;
          display: block;
          font-size: 16px;
          img {
            width: 100px;
            height: 100px;
          }
          p {
            line-height: 40px;
          }
          &:hover {
            color: @xtxColor;
          }
        }
      }
    }
  }
  .ref-goods {
    background-color: #fff;
    margin-top: 20px;
    position: relative;
    .head {
      .xtx-more {
        position: absolute;
        top: 20px;
        right: 20px;
      }
      .tag {
        text-align: center;
        color: #999;
        font-size: 20px;
        position: relative;
        top: -20px;
      }
    }
    .body {
      display: flex;
      justify-content: flex-start;
      flex-wrap: wrap;
      padding: 0 65px 30px;
    }
  }
}
</style>
